28168775 has 6 divisors (see below), whose sum is σ = 34929312. Its totient is φ = 22535000.

The previous prime is 28168771. The next prime is 28168781. The reversal of 28168775 is 57786182.

It is not a de Polignac number, because 28168775 - 2² = 28168771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 563351 + ... + 563400.

It is an arithmetic number, because the mean of its divisors is an integer number (5821552).

Almost surely, 2^28168775 is an apocalyptic number.

28168775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28168775 is a deficient number, since it is larger than the sum of its proper divisors (6760537).

28168775 is a wasteful number, since it uses less digits than its factorization.

28168775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126761 (or 1126756 counting only the distinct ones).

The product of its digits is 188160, while the sum is 44.

The square root of 28168775 is about 5307.4264008086. The cubic root of 28168775 is about 304.2677948175.

The spelling of 28168775 in words is "twenty-eight million, one hundred sixty-eight thousand, seven hundred seventy-five".